Last official estimated population of Champaign County was 40,074 (year 2014)[1]. This was 0.013% of total US population and 0.3% of total Ohio state population. Area of Champaign County is 429.8 mi² (=1113.3 km²), in this year population density was 93.23 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Champaign County population in 2024 would be 40,017 [0].
Historical population of Champaign County for period 1810-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position
[1810-1820] +3.01 %/yr
[1820-1830] +3.65 %/yr
[1830-1840] +3.26 %/yr
[1840-1850] +1.7 %/yr
[1850-1860] +1.38 %/yr
[1860-1870] +0.64 %/yr
[1870-1880] +1.41 %/yr
[1880-1890] -0.31 %/yr
[1890-1900] -0.13 %/yr
[1900-1910] -0.11 %/yr
[1910-1920] -0.5 %/yr
[1920-1930] -0.39 %/yr
[1930-1940] +0.47 %/yr
[1940-1950] +0.59 %/yr
[1950-1960] +1.04 %/yr
[1960-1970] +0.26 %/yr
[1970-1980] +0.99 %/yr
[1980-1990] +0.68 %/yr
[1990-2000] +0.77 %/yr
[2000-2005] +0.35 %/yr
[2005-2010] +0.25 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Champaign County? Visit this page: Settlements in Champaign County, OH
Population of Champaign County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1204 | 1090 | 2,294 |
| 5 to 9 | 1254 | 1228 | 2,482 |
| 10 to 14 | 1394 | 1304 | 2,698 |
| 15 to 19 | 1440 | 1265 | 2,705 |
| 20 to 24 | 1250 | 1116 | 2,366 |
| 25 to 29 | 1078 | 1026 | 2,104 |
| 30 to 34 | 1053 | 1069 | 2,122 |
| 35 to 39 | 1063 | 1095 | 2,158 |
| 40 to 44 | 1302 | 1285 | 2,587 |
| 45 to 49 | 1415 | 1359 | 2,774 |
| 50 to 54 | 1490 | 1499 | 2,989 |
| 55 to 59 | 1420 | 1437 | 2,857 |
| 60 to 64 | 1179 | 1311 | 2,490 |
| 65 to 69 | 1063 | 1151 | 2,214 |
| 70 to 74 | 787 | 855 | 1,642 |
| 75 to 79 | 543 | 641 | 1,184 |
| 80 to 84 | 310 | 422 | 732 |
| 85+ | 240 | 490 | 730 |
Champaign County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| NH | 19166 | 19377 | 38,543 |
| WAC | 18772 | 19036 | 37,808 |
| NHWAC | 18486 | 18793 | 37,279 |
| WA | 18374 | 18701 | 37,075 |
| NHWA | 18117 | 18471 | 36,588 |
| BAC | 763 | 606 | 1,369 |
| NHBAC | 727 | 583 | 1,310 |
| BA | 520 | 386 | 906 |
| NHBA | 506 | 373 | 879 |
| TOM | 414 | 354 | 768 |
| NHTOM | 382 | 339 | 721 |
| H | 319 | 266 | 585 |
| HWAC | 286 | 243 | 529 |
| HWA | 257 | 230 | 487 |
| IAC | 213 | 186 | 399 |
| NHIAC | 191 | 176 | 367 |
| AAC | 144 | 166 | 310 |
| NHAAC | 137 | 162 | 299 |
| AA | 83 | 115 | 198 |
| NHAA | 79 | 114 | 193 |
| IA | 85 | 80 | 165 |
| NHIA | 73 | 74 | 147 |
| HBAC | 36 | 23 | 59 |
| HTOM | 32 | 15 | 47 |
| NAC | 21 | 19 | 40 |
| NHNAC | 21 | 17 | 38 |
| HIAC | 22 | 10 | 32 |
| HBA | 14 | 13 | 27 |
| HIA | 12 | 6 | 18 |
| NA | 9 | 7 | 16 |
| NHNA | 9 | 6 | 15 |
| HAAC | 7 | 4 | 11 |
| HAA | 4 | 1 | 5 |
| HNAC | 0 | 2 | 2 |
| HNA | 0 | 1 | 1 |
• Montgomery County population
38.1 mi, 
226°
• Greene County
31.5 mi, 
192°
• Clark County
14.9 mi, 
183°
• Miami County
25 mi, 
257°
• Union County
23.9 mi, 
61°
• Shelby County
27 mi, 
301°
• Auglaize County
38.1 mi, 
320°
• Logan County
17.6 mi, 
0°
• Madison County
25.3 mi, 
130°
• Hardin County
36.9 mi, 
8°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*Hamilton, Ross Ohio Notes
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